This change offers a faster and more reliable means of managing settings by programs, but it also means that manual edits using text editors will not take immediate effect, which can can frustrate those who might be trying to make such changes on their system. The reason for this is that Mavericks now caches the defaults settings, instead of loading them directly from disk. In earlier version of the OS, this works fine and the settings load when you relaunch the program, but if you try this in OS X Mavericks, the altered setting may not work. In these cases, editing the relevant plist file manually using a text editor is often done.
However, many defaults settings can be deeply nested structures that are too complex to create and manage using the standard defaults command. This type of setting can be invoked simply by running the relevant defaults command in Terminal to write it, followed by reloading the running program (like with the Dock). This can be done for standard settings, but is also useful for enabling hidden settings that Apple has implemented but provides no official setting for, such as moving the Dock to the corner of the display edge instead of being centered. The defaults for programs and system services are usually modified from within the program or OS settings panel, but common practice is to modify them by hand and then reload the relevant service or program to invoke the change. These are commonly seen in the user account's "Preferences" folder, but they exist in other locations and for other purposes in the OS. Start typing and Vi will insert the characters you type into the file rather than trying to interpret them as commands.The main preferences and settings-storage system in OS X is the "defaults," which saves values in binary- or ascii-encoded XML property lists. Entering insert mode is easy once you know it exists - just press the i key once after you’ve positioned the cursor in command mode. Position your cursor at the desired location and press the p key to paste the text you copied or cut.Īside from command mode, the other mode you need to know about is insert mode, which allows you to insert text in Vi. Move your cursor to select text, and then press y to copy the selected text or x to cut it. Position the cursor at the left or right side of the text you want to copy and press the v key. You can select, copy, cut and paste text in command mode. There are a variety of other delete commands - for example, typing dd (press the d key twice) deletes an entire line of text. Press the x key to delete the character under the cursor.
While in command mode, you can move the cursor around with the arrow keys. Trying to type at this screen will result in unexpected behavior. Vi is a modal text editor, and it opens in command mode. It looks like you can just start typing, but you can’t.
This is what you’ll see when you open a file in vi. Use the su command instead if you’re using a non-Ubuntu version of Linux that doesn’t use sudo. So, for example, you’d type sudo vi /etc/fstab if you wanted to edit your fstab file. Remember to use sudo if you want to edit a system file.
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